Abstract
Cavitation inception and desinent behaviors in a cylindrical orifice under transient flow condition are observed using a high-speed video camera. Pressurized sample water with some conditions of air content is accelerated or decelerated by opening or closing of solenoid valve. Pressures upstream and downstream of test section, and the flow rate are measured simultaneously with high-speed video observation. The test orifice is made of transparent acrylic resin. The orifice has nozzle diameter of 1.6mm and throat length in 6mm without inlet roundness. As a result from observation, the time delay of cavitation inception becomes shorter with the increase in upstream pressure in the accelerated flow and longer with the decrease in air content. Growth rate of cavitation also becomes higher with the increase in upstream pressure. For the decelerating flow, cavitation desinence is delayed with the increase in upstream pressure.
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